If a − b = 2c, a + b = 4c and c = 3i + 4j, then what are a and b?
A. a = 9i + 12j and b = 3i + 4j
B. a = 9i – 12j and b = 3i – 4j
C. a = 9i – 12j and b = 3i + 4j
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